A flaw in libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers.
Conclusion & alert: CVE-2025-14523 is rated Moderate Risk (46.7/100): CVSS High severity, with low exploitation likelihood (EPSS 0.50%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.02% | 0.50% | +0.48% |
| 2 | 2026-02-18 | 0.06% | 0.02% | -0.04% |
| 3 | 2026-01-21 | — | 0.06% | — |
Full EPSS history (4 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 8.2 | 3.1 | HIGH |
|
3.9 | 4.2 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2025-14523 not yet assigned priority: Debian including 2 source packages (libsoup2.4, libsoup3), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5, resolved 2. | https://security-tracker.debian.org/tracker/CVE-2025-14523 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2025-14523 |
suse
|
high | CVE-2025-14523 severity important: SUSE including 62 source package names (13.2-9.12:libpython3_11-1_0-3.11.13-1.1, 13.2-9.12:python311-base-3.11.13-1.1, …), 223 product×package rows across 44 product lines (Container suse/sl-micro/6.0/toolbox, Image SLE-Micro, … (44 product lines)): Fixed 219, First Fixed 4. | https://www.suse.com/security/cve/CVE-2025-14523/ |
ubuntu
|
medium | CVE-2025-14523 medium priority: Ubuntu including 2 source packages (libsoup2.4, libsoup3), 13 status rows across 8 suites (bionic, focal, jammy, noble, plucky, questing, upstream, xenial): needed 9, ignored 2, needs-triage 1, released 1. | https://ubuntu.com/security/CVE-2025-14523 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||